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Fulde-Ferrell-Larkin-Ovchinnikov states in equally populated Fermi gases in a two-dimensional moving optical lattice
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作者 Jin-Ge Chen Yue-Ran Shi +2 位作者 Ren Zhang Kui-Yi Gao Wei Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期143-148,共6页
We study the possibility of stabilizing a Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)state in an equally populated two-component Fermi gas trapped in a moving two-dimensional optical lattice.For a system with nearly half f... We study the possibility of stabilizing a Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)state in an equally populated two-component Fermi gas trapped in a moving two-dimensional optical lattice.For a system with nearly half filling,we find that a finite pairing momentum perpendicular to the moving direction can be spontaneously induced for a proper choice of lattice velocity.As a result,the total pairing momentum is tilted towards the nesting vector to take advantage of the significant enhancement of the density of states. 展开更多
关键词 FFLO state optical lattice ultracold fermi gas SUPERFLUID
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Pairing superfluidity in spin-orbit coupled ultracold Fermi gases 被引量:4
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作者 YI Wei ZHANG Wei CUI XiaoLing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第1期1-11,共11页
We review some recent progresses on the study of ultracold Fermi gases with synthetic spin-orbit coupling.In particular,we focus on the pairing superfluidity in these systems at zero temperature.Recent studies have sh... We review some recent progresses on the study of ultracold Fermi gases with synthetic spin-orbit coupling.In particular,we focus on the pairing superfluidity in these systems at zero temperature.Recent studies have shown that different forms of spin-orbit coupling in various spatial dimensions can lead to a wealth of novel pairing superfluidity.A common theme of these variations is the emergence of new pairing mechanisms which are direct results of spin-orbit-coupling-modified single-particle dispersion spectra.As different configurations can give rise to single-particle dispersion spectra with drastic differences in symmetry,spin dependence and low-energy density of states,spin-orbit coupling is potentially a powerful tool of quantum control,which,when combined with other available control schemes in ultracold atomic gases,will enable us to engineer novel states of matter. 展开更多
关键词 spin-orbit coupling ultracold fermi gas SUPERCONDUCTIVITY topological superfluid
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Spin excitation spectra of spin–orbit coupled bosons in an optical lattice
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作者 李若言 贺亮 +2 位作者 孙青 纪安春 田光善 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第5期451-459,共9页
Spin-wave excitation plays important roles in the investigation of the magnetic phases. In this paper, we study the spin-wave excitation spectra of two-component Bose gases with spin-orbit coupling in a deep square op... Spin-wave excitation plays important roles in the investigation of the magnetic phases. In this paper, we study the spin-wave excitation spectra of two-component Bose gases with spin-orbit coupling in a deep square optical lattice using the spin-wave theory. We find that, while the excitation spectrum of the vortex crystal phase is gapless with a linear dispersion in the vicinity of the minimum point, the spectra of the commensurate spiral spin phase and the skyrmion crystal phase are gapped. Significantly, the spin fluctuations strongly destabilize the classical ground state of the skyrmion phase with the appearance of an imaginary part in the eigenfrequencies of spin excitations. Such features of the spin excitation spectra provide further insights into the exotic spin phases. 展开更多
关键词 ultracold fermi gas optical lattice spin-orbit coupling spin excitation spectrum
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Fulde-Ferrell-Larkin-Ovchinnikov pairing states between s- and p-orbital fermions
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作者 Shu-Yang Wang Jing-Wei Jiang +3 位作者 Yue-Ran Shi Qiongyi He Qihuang Gong Wei Zhang 《Frontiers of physics》 SCIE CSCD 2017年第5期27-33,共7页
We study the pairing states in a largely imbalanced two-component Fermi gas loaded in an anisotropic two-dimensional optical lattice, where the spin-up and spin-down fermions are filled to the s- and px-orbital bands,... We study the pairing states in a largely imbalanced two-component Fermi gas loaded in an anisotropic two-dimensional optical lattice, where the spin-up and spin-down fermions are filled to the s- and px-orbital bands, respectively. We show that owing to the relative inversion of the band structures of the s and px orbitals, the system favors pairing between two fermions on the same side of the Brillouin zone, leading to a large stable regime for states with a finite center-of-mass momentum, i.e., the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. In particular, when two Fermi surfaces are close in momentum space, a nesting effect stabilizes a special type of π-FFLO phase with a spatial modulation of π along the easily tunneled x direction. We map out the zero-temperature phase diagrams within the mean-field approach for various aspect ratios within the two-dimensional plane and calculate the Berezinskii-Kosterlitz-Thouless (BKT) transition temperatures TBKT for different phases. 展开更多
关键词 ultracold fermi gas SUPERFLUID optical lattice
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Realization of highly isolated stable few-spin systems based on alkaline-earth fermions
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作者 Wen-Wei Wang Han Zhang +3 位作者 Chang Qiao Ming-Cheng Liang Rui Wu Xibo Zhang 《Frontiers of physics》 SCIE CSCD 2023年第6期231-239,共9页
Few-level systems consisting of a certain number of spin states have provided the basis of a wide range of cold atom researches.However,more developments are still needed for better preparation of isolated few-spin sy... Few-level systems consisting of a certain number of spin states have provided the basis of a wide range of cold atom researches.However,more developments are still needed for better preparation of isolated few-spin systems.In this work,we demonstrate a highly nonlinear spin-discriminating(HNSD)method for isolating an arbitrary few-level manifold out of a larger total number of spin ground states in fermionic alkaline-earth atoms.With this method,we realize large and tunable energy shifts for unwanted spin states while inducing negligible shifts for the spin states of interest,which leads to a highly isolated few-spin system under minimal perturbation.Furthermore,the isolated few-spin system exhibits a long lifetime on the hundred-millisecond scale.Using the HNSD method,we demonstrate a characteristic Rabi oscillation between the two states of an isolated two-spin Fermi gas.Our method has wide applicability for realizing long-lived two-spin or high-spin quantum systems based on alkaline-earth fermions. 展开更多
关键词 few-spin system alkaline-earth atoms ultracold fermi gas a.c.Stark shift long-lived quantum system
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